1Z0-811 Object-Oriented Programming Practice Question
A class 'Base' has a method 'public void display() throws IOException'. Subclass 'Derived' overrides display(). Which exception specifications are allowed in the overriding method?
⚠ Common exam trap
Oracle often tests the misconception that an overriding method can throw any exception, but the key is that only the same exception or a subclass of the parent's exception is allowed for checked exceptions.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
public void display() throws FileNotFoundException
In Java, an overriding method can throw the same exception, a subclass of the exception thrown by the parent method, or no exception at all. The parent method throws IOException, so the overriding method may throw FileNotFoundException (a subclass of IOException). This follows the rule that the overriding method cannot throw a broader checked exception than the overridden method.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
public void display() throws SQLException
Why it's wrong here
SQLException is unrelated checked exception, not allowed.
- ✓
public void display() throws FileNotFoundException
Why this is correct
FileNotFoundException is a subclass of IOException, allowed.
- ✗
public void display() throws Exception
Why it's wrong here
Exception is broader than IOException, not allowed.
- ✗
public void display() throws Throwable
Why it's wrong here
Throwable is broader than IOException, not allowed.
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